Switch to newer openstackdocstheme and reno versions

Switch to openstackdocstheme 2.2.1 and reno 3.1.0 versions. Using
these versions will allow especially:
* Linking from HTML to PDF document
* Allow parallel building of documents
* Fix some rendering problems

Update Sphinx version as well.

Remove docs requirements from lower-constraints, they are not needed
during install or test but only for docs building.

openstackdocstheme renames some variables, so follow the renames
before the next release removes them. A couple of variables are also
not needed anymore, remove them.

Set openstackdocs_pdf_link to link to PDF file. Note that
the link to the published document only works on docs.openstack.org
where the PDF file is placed in the top-level html directory. The
site-preview places the PDF in a pdf directory.

Set openstackdocs_auto_version to not auto-version the documents.
Set openstackdocs_auto_name to use 'project' as name.

Change pygments_style to 'native' since old theme version always used
'native' and the theme now respects the setting and using 'sphinx' can
lead to some strange rendering.

Depends-On: https://review.opendev.org/729744
Change-Id: I5ddb26cadb0b7db435c385271b36c6538830a142

doc/requirements.txt

@@ -1,7 +1,7 @@
 # The order of packages is significant, because pip processes them in the order
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
-sphinx>=1.8.0,!=2.1.0 # BSD
+sphinx>=2.0.0,!=2.1.0 # BSD
-reno>=2.5.0 # Apache-2.0
+reno>=3.1.0 # Apache-2.0
-openstackdocstheme>=1.30.0 # Apache-2.0
+openstackdocstheme>=2.2.1 # Apache-2.0
 sphinxcontrib-apidoc>=0.2.0  # BSD

doc/source/conf.py

@@ -1,7 +1,6 @@
 # Mistral documentation build configuration file
 
 import os
-import pbr.version
 import sys
 
 on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
@@ -43,13 +42,6 @@ master_doc = 'index'
 project = u'Mistral Client'
 copyright = u'2016, Mistral Contributors'
 
-# The version info for the project you're documenting, acts as replacement for
-# |version| and |release|, also used in various other places throughout the
-# built documents.
-version_info = pbr.version.VersionInfo('python-mistralclient')
-release = version_info.release_string()
-version = version_info.version_string()
-
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 exclude_patterns = []
@@ -66,7 +58,7 @@ add_module_names = True
 show_authors = False
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'sphinx'
+pygments_style = 'native'
 
 # A list of ignored prefixes for module index sorting.
 modindex_common_prefix = ['mistralclient.']
@@ -108,6 +100,7 @@ man_pages = [
 ]
 
 # -- Options for openstackdocstheme -------------------------------------------
-repository_name = 'openstack/python-mistralclient'
+openstackdocs_repo_name = 'openstack/python-mistralclient'
-bug_project = 'python-mistralclient'
+openstackdocs_bug_project = 'python-mistralclient'
-bug_tag = ''
+openstackdocs_bug_tag = ''
+openstackdocs_auto_name = False

lower-constraints.txt

@@ -46,7 +46,6 @@ munch==2.1.0
 netaddr==0.7.18
 netifaces==0.10.4
 nose==1.3.7
-openstackdocstheme==1.30.0
 openstacksdk==0.11.2
 os-client-config==1.28.0
 os-service-types==1.2.0
@@ -91,7 +90,6 @@ python-openstackclient==3.12.0
 python-subunit==1.0.0
 pytz==2013.6
 PyYAML==3.12
-reno==2.5.0
 repoze.lru==0.7
 requests-mock==1.2.0
 requests==2.14.2
@@ -100,8 +98,6 @@ rfc3986==0.3.1
 Routes==2.3.1
 simplejson==3.5.1
 snowballstemmer==1.2.1
-Sphinx==1.8.0
-sphinxcontrib-websupport==1.0.1
 statsd==3.2.1
 stestr==2.0.0
 stevedore==1.20.0

releasenotes/source/conf.py

@@ -87,7 +87,7 @@ exclude_patterns = []
 # show_authors = False
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'sphinx'
+pygments_style = 'native'
 
 # A list of ignored prefixes for module index sorting.
 # modindex_common_prefix = []
@@ -128,10 +128,6 @@ html_theme = 'openstackdocs'
 # so a file named "default.css" will overwrite the builtin "default.css".
 # html_static_path = ['_static']
 
-# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
-# using the given strftime format.
-# html_last_updated_fmt = '%b %d, %Y'
-
 # If true, SmartyPants will be used to convert quotes and dashes to
 # typographically correct entities.
 # html_use_smartypants = True
@@ -255,6 +251,7 @@ texinfo_documents = [
 locale_dirs = ['locale/']
 
 # -- Options for openstackdocstheme -------------------------------------------
-repository_name = 'openstack/python-mistralclient'
+openstackdocs_repo_name = 'openstack/python-mistralclient'
-bug_project = 'python-mistralclient'
+openstackdocs_bug_project = 'python-mistralclient'
-bug_tag = ''
+openstackdocs_bug_tag = ''
+openstackdocs_auto_name = False